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  • Aug 18 10:19
    megies commented #3130
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    megies on maintenance_1.3.x

    Match "https://" as well as "ht… Add Liam to CONTRIBUTORS.txt Update CHANGELOG.txt and 2 more (compare)

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Tobias Megies
@megies
2 replies
igmuhlmann
@igmuhlmann
Hi. Can I use simulate_seismometer to simulate the response of a theoretical instrument to simulated ground motion (i.e. assume a step function as displacement and run simulate_seismometer in order to get what a real sensor would see)? I don't see how I can tell simulate_seismometer what it currently sees (displacement, velocity or acceleration) as input parameters. Thanks for a short answer - and sorry if my question is trivial.
2 replies
Munkhsaikhan Amarsanaa
@BoDoNgAhAi
Hello everyone! Does someone know how to read GeoSIG data in obspy? or an alternative way? Thank you.
4 replies
aaaaa-ch
@aaaaa-ch
Hello, Does someone know how to change the .sgy to .txt file? Thank you.
starr34
@starr34
@aaaaa-ch you can perform this work by adopting from obspy.io.segy.core import _read_segy and simply write it to ASCII format
branyan12
@branyan12
Hello everyone, does anyone know how to add different levels of noise to the waveform in .mseed format?
Tobias Megies
@megies
You can add another array on top of your Trace's data
tr.data = tr.data + np.random.randn(len(tr)) * 1000
The real question is what kind of noise do you want to add and how to create the sample noise ;-)
@branyan12
branyan12
@branyan12
Ok, super thanks
John F. Rudge
@johnrudge
An advert: Ever wanted an ellipticity correction for a taup ray path? Well, now you can with EllipticiPy: https://github.com/StuartJRussell/EllipticiPy
Ultimately EllipticiPy should probably end up in the main obspy package, but for now it is separate. Please do test if you're interested and let me know any issues you find.
Tobias Megies
@megies
:thumbsup:
Derrick Chambers
@d-chambers
@barsch we aren't doing this liberapay thing anymore to support ObsPy right? Or are you still getting money from that source to run the server? I ask because my yearly donation is coming up and I need to know if I should cancel.
Robert Barsch
@barsch
@d-chambers I stopped everything - any payment therefore shouldn't go through - but canceling may be better to prevent any issues
Derrick Chambers
@d-chambers
:thumbsup:
aaaaa-ch
@aaaaa-ch
Hello everyone, Why are two thresholds set when using classic sta lta.
aaaaa-ch
@aaaaa-ch
plot_trigger(trace, cft, 1.5, 0.5) I think 1.5 and 0.5 represent two thresholds in the script, right?
John Aiken
@mnky9800n
This may be a question that is not exactly an "obspy" question. why does aic trigger often pick after an event when the event is tapered/zeropadded/etc?
Figure 3 (1).png
the way i understand it, aic is basically a comparison of the aic score where the model is the signal variance https://docs.obspy.org/packages/autogen/obspy.signal.trigger.aic_simple.html
image.png
so if you minimize the tiny equation why is the minimum AIC after the signal?
John Aiken
@mnky9800n
also what is N in the equation? maybe i just dont understand how its calculated
Tobias Megies
@megies
@aaaaa-ch it is the thresholds to activate and then again deactivate the trigger, see e.g. https://docs.obspy.org/citations.html#withers1998
Ch_song
@Chsong98255117_twitter
Hello everyone, I don't how to read the waveform in this format with the obspy. Hope to get help.
i dont know this css file format but it has some files that have .w as ending maybe it is something like that, not sure
Ch_song
@Chsong98255117_twitter
Great thanks.
Tobias Megies
@megies
CSS seems to usually have a file that lists contents of other files though.. not sure if its easy to workaround that file missing
usually its discouraged to use private, low level reader functions but you can see it anything of these can help you
Ch_song
@Chsong98255117_twitter
Yes, Thanks for your selfless help.
Ch_song
@Chsong98255117_twitter
Hello everyone. Do you know how to calculate the site amplifying factor and quality factor?
Dan Burk
@tychoaussie

Hi everyone,
I have been experimenting with the PPSD spectral_estimation.py code, adding some colorization to the various plot overlays such as the mean, mode, and percentile graphs. I want to add a little bit of optimization to the PPSD plot, as the overlays default to black. How would I go about becoming a first-time contributor to the project ?

!(https://photos.app.goo.gl/sC4ZcdVWrm8vBoeH7)

anirudhakumar619
@anirudhakumar619
Hello all,
Something weird happens when I try to trim a trace (both with trim and slide commands). The start-time of the trimmed output is like 4 milliseconds ahead of the start-time that I provide in the code, irrespective of the time I give (unless I give an integer value in second+ say 4 millisecond). I kinda need to trim different stations' data all at the same point in time to run a cross-correlation code on it... but this glitch is keeping me from it.
I tried playing around with resampling, but that doesn't work.
Anybody else face such issues?? How did you solve it??
Tobias Megies
@megies
@tychoaussie you can just open a pull request on github with your version of the code, let us know if u need more help how to go about it. Since that is a feature change you should base your work off of master branch
@anirudhakumar619 what is your sampling rate? Data will always be cut to one of your samples, depending on setting of nearest_sample that sample might be left or right of the given time. If you need to have the same time and the samples dont align you could resample your data to have the exact same sampling points, but personally I would not do that and rather adjust the timing in the cross correlation function that you get as output
https://docs.obspy.org/master/packages/autogen/obspy.core.trace.Trace.trim.html?highlight=nearest_sample
Joseph Rapula Maritinkole
@maritinkolej
Hello everyone.
I am an obspy beginner. I want to get the events catalog from ISC, including arrival information and pick-trace information, and then use this information to download the corresponding waveform from IRIS. (I am labeling the dataset for deep learning training).
I am encountering some problems here,
from obspy.clients.fdsn import Client
from obspy import UTCDateTime
-->client = Client("ISC")
-->t0 = UTCDateTime(2020, 1, 2)
-->t1 = UTCDateTime(2020, 1, 4)
-->cat = client.get_events(t0, t1, minlatitude=-30, maxlatitude=-16,
minlongitude=20, maxlongitude=28, includearrivals=True)
-->print(cat.str(print_all=True))
-->print(cat.events[0].picks[3])
The output I am getting has an error in the Network code. WaveformStreamID
network_code: 'IR'
station_code: 'KHWEE'
channel_code: ''
location_code: '--'
The network is supposed to be BX here. Now I cannot get waveforms from IRIS, I will be happy to discuss this further because I am getting lots of errors. Maybe because I am a newbie.
Tobias Megies
@megies
Maybe you should talk to ISC why they use this alternate code for those stations. I am guessing you are trying to download data based on the WaveformStreamID of the picks in the event files in an automated way? That's a good approach and you can simply fix the network code on the fly in your program, something like..
from obspy.clients.fdsn import Client
client = Client('IRIS')
inv = client.get_stations(network='BX', level='station')
sta_codes_bx = [sta.code for net in inv for sta in net]

for pick in event.picks:
    is_IR = pick.waveform_id.network_code == 'IR'
    should_be_BX = pick.waveform_id.station_code in sta_codes_bx
    if is_IR and should_be_BX:
        pick.waveform_id.network_code = 'BX'
    client.get_waveforms(....)
Roberto Guardo
@RobertoGuardo

Hi everyone,
If I use the command scan inside a script.py it raises an error like this:
PermissionError: [WinError 5] Access denied: '/$Recycle.Bin\S-1-5-18'
on Ubuntu the error is almost the same.

What I do is the following:
from obspy.imaging.scripts.scan import scan
scan("path_to_traces","output_path",verbose=True)

Trying to emulate what I do from the shell:
obspy-scan input_trace_path -v -o outputTracePath

From the shell I do not have any problem, from the script it doesn't work.
Any clue?
Thanks

6 replies
Elham-Moslemi
@Elham-Moslemi
Hi all,
I want to make a recod_section. According to the page obspy.core.stream.Stream.plot in the "section" part, I must define distance or event coordinates to plot section type. Is there a documentation or example code you would know that can help me how do I add them in the sac header?
3 replies
ankara17
@ankara17
index.jpeg
Hai, how to plot psd in 3 components like that?
6 replies
ankara17
@ankara17
@megies @krischer
Adebayo Ojo
@boyoforex

Hello all,

I need help with instrument response removal using poles and zeros. All the information I have about the seismometer is stated here (https://www.gfz-potsdam.de/en/section/geophysical-imaging/infrastructure/geophysical-instrument-pool-potsdam-gipp/pool-components/poles-and-zeros/3d-geophone) and below:

No Damping Resistor
Gs = 28.8 V/(m/s); Ds = 0.56; fs = 4.5 Hz

2 Zeros
z1 = 0
z2 = 0

2 Poles
p1 = -15.88 23.43i
p2 = -15.88 -23.43i

Normalisation Factor
a = 1.0

I can see the code example using PAZ dictionary here: https://docs.obspy.org/tutorial/code_snippets/seismometer_correction_simulation.html#using-a-paz-dictionary but not sure which of these parameters correspond to the ones used in the example.

There is also a response file available here: https://www.gfz-potsdam.de/fileadmin/gfz/sec22/pdf_doc/GIPP/RESP.XX.NS532..SLZ.HG6.375.100000.4_5B.28_8.txt and also on IRIS NRL: http://ds.iris.edu/NRL/sensors/hgs/RESP.XX.NS532..SLZ.HG6.375.9090.4_5B.27_7 but didn't work with ObsPy.

I kept getting "ValueError: No matching response information found" error when I use these files (after modifying the channel name, station name and start and end dates).

Kindly provide me some guidance on using the parameters or response file successfully.

Thanks!

6 replies
shrrylee
@shrrylee
Hello all, I want to read a MSD file,Why is the running result displayed:“known blockette length for type 1002”“msr_unpack(GD_TST1_00_BHN_D): Unknown blockette length for type 1002”....Looking forward to the help of kind people
1 reply
image.png